Air filter



H. S. KAISER Oct. 29, 1935.

AIR FILTER Filed March 1, 1933 Patented Oct. 29, 1935 UNITED STATES AIR FILTER Harry S. Kaiser, Chicago, 111., assignor to HIS.

Kaiser Company, Chicago, 111., a corporation of Illinois Application March 1,

9 Claims.

The invention relates to air filters and has among its principal objects the provision of a simple, inexpensive and eflicient device constructed of fibrous material fashioned to provide a self-supporting integrate body having passageways provided therein through which air may circulate and have foreign particles removed therefrom by impingement thereof with a cleansing medium carried by said body which arrests the passage of said particles.

Another object of the invention is to provide a. self-supporting integrate filter body which is constructed of fibrous material capable of absorbing a cleansing medium such as oil or some other viscous material, the filter body structure being characterized by its ability to resist the disintegrating action of moisture contained in the cleansing medium, and separation due to temperature changes and separation due to the force of air currents circulated through said body.

The invention also has as an object constructing the device of strips of fibrous material and to fashion said strips and to connect said strips with each other to thereby provide passageways extending through said body and which will also result in maintaining said strips in said unitary relation under the action of the forces above referred to.

In addition to the above, it is an object of the invention to construct the filter of fibrous or absorbent material and arrange the passageways thereof at an angle to the face of the body.

Another object of the invention is to provide a filter body having passageways of relatively different cross sectional areas and to arrange the passageways of larger cross section to present these to the entering air, to thereby provide means at the entrance whereby the relatively larger particles of foreign matter may be arrested in their passage without causing the clogging of said passageways, and thereby result in I a lowering of the cleansing efficiency of the device.

The invention also has as an object the provision of a structure in which the elements or strips of which one device may be fabricated are arranged at an angle to the strips of another device.

The invention has these and other objects, all of which will be explained in detail and more readily understood when read in conjunction with the accompanying drawing which illustrates various embodiments of which the invention is susceptible, it being therefore manifest that changes and modifications may be resorted to 1933, Serial No. 659,034

without departing from the spirit of the appending claims forming a parthereof.

In the drawing:

Figure 1 is a perspective view of a filter body constructed in accordance with the invention;

Figure 2 is an enlarged front elevation of a. fragment of the structure shown in'Figure 1;

Figure 3 is a section taken on line 3-3 of Figure2;

Figure 4 ure2;

Figure 5 is a sectional view of amodified structureshowing a pluralityflof' filtering elements arranged relatively 'to each-otherto cause air to travel in a tortuous path;

Figure 6 is. aviewsimilarto Figure 2, showing 15 a modified arrangement which may be resorted to; v

Figure 7 is a sectional viewillustrating a device constructed to provide afiltering body having passageways of difierentcross sectional areas;

Figure 8 is a view showing a device comprised of strips arranged at an angle to each other.

This application is 'a continuation in part of the application filed by me September 24, 1930, Serial No. 484,054, allowed September 3, 1932.

The invention contemplates the, provision of a filter element, generally designated l0, comprised of fibrous or moisture absorbent material suchas for example paper, which is fabricated to produce a self-sustaining unitary body capable of being introduced as a unit to or be removed as a unit from an air duct through which air to be cleansed is circulated.

The structure illustrated in Figure 1 contemplates the utilization of strips of fibrous or absorbent material, respectively designated ll, l2 and I3, the strips being connected with each other to provide a self-supporting unitary body I0 capable of being arranged for use in either a vertical or horizontal position. In the particular structure illustrated in Figure 1, the strips 12 are corrugated, the strips H and I3 being arranged upon opposite sides of the corrugated strips to thus provide passages I4 and V [5 located upon opposite sides of the. corrugated strip. These strips ll, 12 and I3 are connected with each other to provide the self-sustaining unitary filter member I I] and the passages l4 and I5 through which air may circulate to be cleansed. 50 It will be noted that a portion such as I 8 of the material of the corrugated strip provides a wall of adjacent passages and in addition provides a connecting web which adds strength to the structure and will assist to prevent bowing of the 55 is a section taken on line 4-4 of Fig- 10 strips in the direction of the air circulated through said device.

The strips ll, l2 and I3 are permanently connected with each other along the crests of the corrugations and may be glued, sewed, or stapled, as indicated at I1 and thus provide a construction capable of resisting the action of force applied to the face of the body III and will also resist separation of said elements by expansion and contraction. In addition this connection will assist to maintain the passages l4 and I5 against closing and will also assist to prevent bowing of the strips in the direction of the air currents circulating through the passages l4 and I5, and furthermore, will prevent separation of the strips and the occurrence of gaps or other spaces between the strips which it has been found materialb reduces the efiiciency of the structure.

It is an object of the invention to arrange the passages such as M and I5 at an angle either in the manner shown in Figure 3 or at any other desired angle to the face of the body. To this end the passages may be arranged as illustrated in Figure 5, wherein are illustrated several units such as It, arranged relatively to each other to provide a tortuous path for the air circulating through these units, which thus increases the cleansing efiiciency of the structure. This structure may embody the use of two or more separate units such as l9 and IS.

A modified arrangement is illustrated in Figure 6. In this structure all of the elements are of a corrugated character, and are respectively indicated by the numerals 20, 2| and 22, it being understood that these elements are of a fibrous or absorbent material and are connected with each other to provide a unit or body such as that designated I in Figure 1. The unit or body member l0 may be dipped, sprayed, or otherwise provided with a viscous material, such as oil, which penetrates the material and is retained thereby and will thus supply the air passages l4 and I therewith for impingement thereby of air circulating through said passages and thus will gather any foreign particles contained in the air and arrest the passage thereof. Manifestly, as these foreign particles accumulate in the passages, these particles absorb some of the viscous material with which the absorbent elements are impregnated and thus they also become saturated, presenting a viscous surface to other particles lodging thereon which arrests their passage and thus produces an efficient arrangement for cleansing air circulating therethrough.

The structure illustrated in Figure 7 contemplates the use of a filtering body formed in a 'manner to provide passages of relatively different cross sectional area and in this instance this structure is comprised of two separate self-sustaining unitary bodies 24 and 25 whichare suitably connected With each other as for instance, by the outer frame 26. The body 24 is provided with passages 21 and the body 25 is formed with the passages 28 which it will be noted are of a lesser cross sectional area than the passages 21. It is contemplated to arrange the larger passages so that these are presented to the air as it enters the device and, therefore, relatively large foreign particles may be engaged and arrested in their passage, and by virtue of the area of these passages a relatively large number of particles may be arrested before the efflciency of the device is materially reduced.

The structure shown in Figure 8 illustrates another arrangement of filter bodies which may be employed to increase the path of travel of air circulating through the structure. In this structure the strips 29 of one body are arranged at an angle to the strips of another body and one body is located inrear of the other. The passages of one of these bodies may be disposed at an angle to the passages of the other body as shown in Fig. 5 and in addition may involve the structural features shown in Fig. 7.

In the foregoing description of the invention, it is believed manifest that a self-supporting unitary body is produced having air passages arranged therethrough, the body being comprised of absorbent material and constructed in a manner to prevent separation of the elements by expansion and contraction due to moisture and also temperature changes. It is also believed evident that the invention also results in a structure in which the elements are retained in their 2 proper unitary relation when subject to air currents of high velocity which will prevent bowing in the direction of the air currents and the separation of the elements and the formation of gaps between the elements which, it has been found. 2 materially reduces the efliciency of the structure. Having thus described the invention, what I claim and desire to cover by Letters Patent is: 1. An air filter body providing a carrier for a substance which substance serves as a means for arresting passage of foreign particles contained in air circulating through said body, said body consisting of a plurality of fibrous, absorbent sheets, including a plurality of corrugated sheets, said sheets comprising said body being in engagement with each other and being inseparably connected at the engaging portions thereof and cooperating with each other to provide a single inseparable unitary body having a plurality of tubular open ended air passages extending continuously through said body.

2. An air filter body providing a. carrier for a substance which substance serves as a means for arresting passage of foreign particles contained in air circulating through said body, said body consisting of a plurality of fiat and corrugated fibrous absorbent sheets, the flat sheets being located upon opposite sides of each of said cormgated sheets, said sheets comprising said body being inengagement with each other and being inseparably connected at the engaging portions thereof and cooperating with each other to provide a single inseparable unitary body having a plurality of tubular open ended air passages extending continuously through said body.

3. An air filter body providing a carrier for a substance which substance serves as a means for arresting passage of foreign particles contained in air circulating through said body, said body consisting of a plurality of fibrous,absorbent elements inseparably connected with each other into 4 a single inseparable unitary body, and said elements being formed to provide a plurality of tubular open ended air passages extending continuously through said body, said body having a substance applied thereto serving to arrest particles contained in air circulating through said body.

4. An air filter body consisting of fibrous material adapted to absorb an air cleansing medium applied thereto, said material being in the form of an integral apertured body having a plurality of rows of open ended tubular passages which extendthrough said body and provide passages for the circulation of air and the impingment of airwith said cleansing medium, the fibrous material being inseparably united at said passages to thereby retain the material of said body in a relation to maintain the tubular formation of the passages, said passages being of relatively different cross sectional area from one end to the other thereof.

5. An air filter body consisting of fibrous material adapted to absorb an air cleansing medium applied thereto, and having said medium applied, said material being in the form of an integral apertured body having a plurality of rows of open ended tubular passages which extend through said body and provide passages for the circulation of air and the impingment of air with said cleansing medium, the fibrous material being inseparably united at said passages to thereby retain the material of said body in a relation to maintain the tubular formation of the passages, said passages being of relatively diflerent cross sectional area from one end to the other thereof.

6. A composite air-filtering block acting as a carrier for a substance which serves as a means for arresting passage of foreign particles impinging thereon and contained in air flowing through said block, said block consisting of two connected air filtering units arranged in series, each of said units consisting of a plurality of fibrous, absorbent sheets, alternately corrugated and substantially fiat to define between them a plurality of air passages of substantially equal cross-sectional area passing through said unit from face to face, said sheets being attached to each other at the crests of and substantially throughout the length of the corrugations, said connections providing means for supporting said sheets one from the other to form a rigid unit and maintaining the same against relative displacement.

7. A composite air-filtering block acfing as a carrier for a substance which serves as a means for arresting passage of foreign particles impinging thereon and contained in air flowing through said block, said block consisting of two connected air filtering units arranged in series, each of said units consisting of a plurality of fibrous, absorbent sheets, alternately corrugated and substantially flat to define between them a plurality of air passages of substantially equal cross-sectional area passing through said unit from face to face, said sheets being attached to each other at the crests of and substantially throughout the length of the corrugations, said connections providing means for supporting said sheets one from the other to form a rigid unit and maintaining the same against relative displacement, the passages in one unit being at an angle 5 to those in the other to deflect the air streams and cause the entrained particles to impinge on the substance coated walls thereof.

8. A composite air-filtering block acting as a carrier for a. substance which serves as a means for arresting passage of foreign particles impinging thereon and contained in air flowing through said block, said block consisting of two connected air filtering units arranged in series, each of said units consisting of a plurality of fibrous, absorbent sheets, alternately corrugated and substantially flat to define between them a plurality of air pamages of substantially equal cross-sectional area passing through said unit from face to face, said sheets being attached to each other at the crests of and substantially throughout the length of the corrugations, said connections providing means for supporting said sheets one from the other to form a rigid unit and maintaining the same against relative displacement, the passages in one unit being at an angle to those in the other to deflect the air streams andcause the entrained particles to impinge on the substance coated walls thereof, the passages in the unit first receiving the air being of greaer cross-sectional area than in the second unit of the block.

9. An air-filtering unit acting as a carrier for a viscous liquid serving to arrest solid particles impinging thereon and contained in air flowing through said unit, said unit being of substantial thickness and having a plurality of open ended passages extending therethrough from face to face thereof, said unit being rigid and self-supporting and formed of a plurality of sheets of flexible, absorbent, fibrous material of a width equal to the thickness of the unit and alternately fiat and corrugated at an angle to the edges lying in said faces, the crests of all corrugations being secured permanently to the adjacent fiat sheets to secure 5 all of the sheets together in self-supporting relation and to prevent separation and displacement of said sheets.

HARRY KAISER. 

